I made the backgrounds for the content boxes translucent, personally, I LOVE the subtle effect it makes, looks pretty damn awesome.

Here's the code for those interested:

filter:alpha(opacity=85);
-moz-opacity:0.85;
opacity:0.85;

Add those three rules to your stylesheet for any class that has a background colour set. The values in it set the transparency. 00 and 0.00 would be completely transparent, 100 and 1.00 is solid colour.